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Organelle by Day

Meiosis Two

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Prophase II

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Story

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Prophase II: Part 1:

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Chromosome Condensation: 

The chromosomes, which may have decondensed slightly at the end of telophase I, condense again into visible, compact structures

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Prophase II: Part 2:

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Nuclear Envelope Breakdown:

If the nuclear envelope reformed at the end of telophase I, it breaks down again, allowing the spindle fibers to access the chromosomes

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Prophase II: Part 3:

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Spindle Formation:

A new spindle apparatus forms, with microtubules extending from the centrosomes, which have migrated to opposite poles of the cell

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Prophase II: Part 4:

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Centrosome Movement:

The centrosomes, which duplicated during interphase I, migrate to opposite poles of the cell, establishing the spindle poles for the second meiotic division

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Prophase II: Part 5:

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Two Haploid Cells:

Prophase II occurs in two cells, each produced from the first meiotic division, and each containing a haploid set of chromosomes (one chromosome from each homologous pair)

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Metaphase II

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Story

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Metaphase II: Part 1:

Chromosome Alignment:

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Metaphase II: Part 2:

Microtubule Attachment:

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Metaphase II: Part 3:

Spindle Formation:

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